You've probably heard of shell companies, tax havens and offshore trusts. But how common are they? How many people use these techniques as a way to squirrel away money from the prying eyes of taxpayers, governments and non-billionaires? What exactly did these Panama Papers reveal?

There's no two ways about it: oil spills and gas leaks are disastrous, causing massive amounts of ecological damage in a matter of days or hours. So how many occur each year? How many are actually reported, versus covered up? Listen in to learn more.